pub fn bi_dup<BuiltinTok, SeqTok, Sdata, Sexec, O>( ctxt: &mut Runtime<BuiltinTok, SeqTok, Sdata, Sexec, O>, ) -> Result<(), Error>where Sdata: Stack<Item = i32>, Sexec: ExecutionStack<BuiltinTok, SeqTok>, SeqTok: Clone, BuiltinTok: Clone, O: Write,